Cansas-II SiCf/SiC复合材料的高温拉伸蠕变行为

doi:10.15541/jim20220441

无机材料学报 ›› 2023, Vol. 38 ›› Issue (2): 177-183.DOI: 10.15541/jim20220441

Cansas-II SiC_f/SiC复合材料的高温拉伸蠕变行为

荆开开¹(), 管皞阳¹, 朱思雨¹, 张超¹^,², 刘永胜¹^,³, 王波²^,⁴, 王晶¹^,³, 李玫¹, 张程煜¹^,²()

1.西北工业大学材料学院 NPU-SAS联合研究中心, 西安 710072
2.西北工业大学极端力学研究院,, 西安 710072
3.西北工业大学超高温结构复合材料重点实验室, 西安 710072
4.西北工业大学航空学院, 西安 710072

收稿日期:2022-07-29 修回日期:2022-09-10 出版日期:2023-02-20 网络出版日期:2022-09-15
通讯作者: 张程煜, 教授. E-mail: cyzhang@nwpu.edu.cn
作者简介:荆开开(1997-), 男, 硕士研究生. E-mail: 2247436229@qq.com
基金资助:
国家自然科学基金(U2241239);国家自然科学基金(51572224);国家自然科学基金(12102336);高等学校学科创新引智计划(BP0820014);陕西省科技重点项目(2017KW-019)

Tensile Creep Behavior of Cansas-II SiC_f/SiC Composites at High Temperatures

JING Kaikai¹(), GUAN Haoyang¹, ZHU Siyu¹, ZHANG Chao¹^,², LIU Yongsheng¹^,³, WANG Bo²^,⁴, WANG Jing¹^,³, LI Mei¹, ZHANG Chengyu¹^,²()

1. NPU-SAS Joint Research Center, School of Materials, Northwestern Polytechnical University, Xi’an 710072, China
2. Institute of Extreme Mechanics, Northwestern Polytechnical University, Xi’an 710072, China
3. Key Laboratory of Ultra-High Temperature Structural Composites, Northwestern Polytechnical University, Xi’an 710072, China
4. School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China

Received:2022-07-29 Revised:2022-09-10 Published:2023-02-20 Online:2022-09-15
Contact: ZHANG Chengyu, professor. E-mail: cyzhang@nwpu.edu.cn
About author:JING Kaikai (1997-), male, Master candidate. E-mail: 2247436229@qq.com
Supported by:
National Natural Science Foundation of China(U2241239);National Natural Science Foundation of China(51572224);National Natural Science Foundation of China(12102336);Disciplinary Innovation and Talent Introducing Plan for Colleges and Universities(BP0820014);Key Project of Science and Technology of Shaanxi Province(2017KW-019)

摘要/Abstract

摘要：

连续碳化硅纤维增强碳化硅复合材料(SiC_f/SiC)是发展先进航空发动机的关键材料, 航空发动机长时服役要求材料具有优异的高温蠕变性能。本工作研究了平纹编织Cansas-II碳化硅纤维增强碳化硅复合材料(2D-SiC_f/SiC)在空气中的高温蠕变行为, 蠕变温度为1200~1400 ℃, 应力水平为80~140 MPa。利用扫描电子显微镜(SEM)观察了2D-SiC_f/SiC复合材料的微观组织和断口形貌, 使用能谱分析仪(EDS)进行了成分分析。结果表明: 当蠕变应力低于比例极限应力(σ_PLS)时, 2D-SiC_f/SiC的蠕变断裂时间超过500 h, 稳态蠕变速率为1×10^-10~5×10^-10 /s, 蠕变行为由基体和纤维共同控制。当蠕变应力高于σ_PLS时, 复合材料的基体、纤维和界面均发生氧化, 蠕变断裂时间显著降低, 稳态蠕变速率提高一个数量级, 蠕变行为主要由纤维控制。

关键词: Cansas-II SiC_f/SiC复合材料, 蠕变, 蠕变断裂时间, 稳态蠕变速率, 基体开裂

Abstract:

Continuous silicon carbide fiber reinforced silicon carbide composite (SiC_f/SiC) is a key material for the advanced aero-engines. It is required to possess excellent high-temperature creep resistance for SiC_f/SiC to meet the long-term service lifetime of the aero-engines. Here, tensile creep behaviors of a plain woven Cansas-II SiC_f/SiC (2D-SiC_f/SiC) were investiged in the temperature of 1200-1400 ℃ with the stress levels of 80 to 140 MPa. Its microstructure and fracture morphology were observed, and composition was analyzed. Results show that creep-rupture time of 2D-SiC_f/SiC is more than 500 h and steady-state creep rate is 1×10^-10-5×10^-10 /s at stresses lower than the proportional limit stress (σ_PLS). The creep behaviors are controlled by matrix and fibers. The creep-rupture time is significantly reduced, and the steady-state creep rate is increased by an order of magnitude when the stress is higher than the σ_PLS. The matrix, fibers and interfaces of the composite are greatly oxidized, and the creep behaviors are mainly controlled by the fibers.

Key words: Cansas-II SiC_f/SiC, creep, creep rupture time, steady-state creep rate, matrix cracking

中图分类号:

TB332

荆开开, 管皞阳, 朱思雨, 张超, 刘永胜, 王波, 王晶, 李玫, 张程煜. Cansas-II SiC_f/SiC复合材料的高温拉伸蠕变行为[J]. 无机材料学报, 2023, 38(2): 177-183.

JING Kaikai, GUAN Haoyang, ZHU Siyu, ZHANG Chao, LIU Yongsheng, WANG Bo, WANG Jing, LI Mei, ZHANG Chengyu. Tensile Creep Behavior of Cansas-II SiC_f/SiC Composites at High Temperatures[J]. Journal of Inorganic Materials, 2023, 38(2): 177-183.

图/表 12

表1 国产二代Cansas-II碳化硅纤维的基本性能

Table 1 Basic properties of domestic second-generation Cansas-II silicon carbide fibers

Diameter/ μm	Density/ (g·cm^-3)	Tensile strength/GPa	Tensile modulus/GPa
14	2.74	2.7	270

表2 2D-SiCf/SiC的拉伸性能

Table 2 Tensile properties of 2D-SiCf/SiC composites

Temperature/℃	E/GPa	σ_PLS/MPa	σ_UTS/MPa	ε/%
RT	273	115	282	0.57
1200	259	110	249	0.74
1300	223	92	229	0.60

图1 拉伸和拉伸蠕变试样形状与尺寸(单位: mm)

Fig. 1 Dimensions and shape of tensile and tensile creep specimen (unit: mm)

图2 2D-SiCf/SiC的高温拉伸蠕变曲线

Fig. 2 Tensile creep curves of 2D-SiCf/SiC at high temperatures (a) 1200 ℃, different stress; (b) 1300 ℃, different stress; (c) 1400 ℃, different stress; (d) Different temperatures, 100 MPa

表3 2D-SiCf/SiC复合材料在空气中的高温拉伸蠕变性能

Table 3 Tensile creep properties of 2D-SiCf/SiC composites in air at high temperatures

Specimen	Tempera- ture/℃	Stress/ MPa	Steady-state creep strain rate/s^-1	Creep rupture time/h	Creep strain/%
2D-SiC_f/SiC	1200	100	1.86×10^-10	>560	0.20
	1200	110	4.95×10^-10	>560	0.23
	1200	120	2.16×10^-9	42	0.18
	1200	140	8.45×10^-7	0.1	0.21
	1300	90	5.62×10^-10	>500	0.28
	1300	100	1.73×10^-9	70	0.20
	1300	120	1.86×10^-8	6	0.28
	1400	80	1.32×10^-9	88	0.33
	1400	100	1.46×10^-8	1.6	0.57
CVI-SiC_f/SiC^[13]	1300	75	2.3×10^-9	111.1	—
	1300	90	6.2×10^-8	33.4	—
	1300	120	3.6×10^-7	0.83	—
	1300	150	3.0×10^-6	0.14	—
MI-SiC_f/SiC^[15]	1204	125	3.0×10^-11	>1000	0.25
	1204	140	2.3×10^-10	>1000	0.31
	1204	150	—	82.1	0.29

图3 不同状态的2D-SiCf/SiC的拉伸应力-应变曲线

Fig. 3 Tensile stress-strain curves of as-received and crept 2D-SiCf/SiC

表4 2D-SiCf/SiC蠕变后的剩余拉伸性能

Table 4 Residual tensile properties of 2D-SiCf/SiC after creeping

		σ_UTS/MPa	E/GPa	σ_PLS/MPa	ε/%
As-received		282	273	115	0.57
Crept	1200 ℃/100 MPa	211	—	—	—
	1200 ℃/110 MPa	173	209	89	0.25
	1300 ℃/90 MPa	138	157	55	0.17

图4 2D-SiCf/SiC在不同条件下的断口宏观形貌

Fig. 4 Macroscopic morphologies of fractures of 2D-SiCf/SiC under different conditions (a) As-received; (b) Crept at 1200 ℃/110 MPa for 560 h; (c) Crept at 1200 ℃/120 MPa; (d) Crept at 1200 ℃/140 MPa

图5 2D-SiCf/SiC在不同条件蠕变断裂的断口氧化区形貌

Fig. 5 Morphologies of fracture oxidation zone of 2D-SiCf/SiC under different creep rupture conditions (a) 1200 ℃/120 MPa; (b) 1300 ℃/100 MPa; (c) 1400 ℃/80 MPa

图6 1300 ℃/100 MPa 蠕变过程中2D-SiCf/SiC中发生的界面和纤维损伤

Fig. 6 Interface and fiber damage in 2D-SiCf/SiC during creeping at 1300 ℃/100 MPa (a) SiO2 filled; (b) SiO2 unfilled

图7 2D-SiCf/SiC蠕变后的纵向纤维微观组织

Fig. 7 Longitudinal fiber microstructures of 2D-SiCf/SiC after crept (a)1200 ℃/110 MPa for 560 h; (b)1300 ℃/90 MPa for 500 h

图8 2D-SiCf/SiC的Larson-Miller曲线

Fig. 8 Larson-Miller plots for 2D-SiCf/SiC

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Cansas-II SiC_f/SiC复合材料的高温拉伸蠕变行为

Tensile Creep Behavior of Cansas-II SiC_f/SiC Composites at High Temperatures

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Cansas-II SiCf/SiC复合材料的高温拉伸蠕变行为

Tensile Creep Behavior of Cansas-II SiCf/SiC Composites at High Temperatures

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Cansas-II SiC_f/SiC复合材料的高温拉伸蠕变行为

Tensile Creep Behavior of Cansas-II SiC_f/SiC Composites at High Temperatures